Smoke-consuming furnace



(No Model.)

M. H, STEELE.

SMOKE GONSUMING FURNAGE. No. 393,182. Patented Nov. 20', 1888.

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STATES PATENT OFFICE.

MICHAEL H. STEELE, OF KALAMAZOO, MICHIGAN.

SMOKE-CONSUIVIING FURNACE.

SPECIFICATION forming part of Letters Patent No. 393,182, dated November 20, 1888.

Application filed March 13, 1888. Serial No. 267,097. (No model.)

struct an arch having a combustion-chamber enlarged well above the fuel-grate and rear draft-passage, said draft-passage leading into a narrow passage-way which extends upward and thence rearwardly beneath the boiler, (or upperinclosure of the arch,) whereby the flame from which the smoke has been consumed flows through said narrow passage beneath the boiler or upper inclosure.

In the drawings forming apart ofthis specification, Figure 1 is an elevation with parts in section on dotted line 1 1 in Fig. 2; Fig. 2, a view looking from a point at left of Fig. 1, parts being broken away; Fig. 3, an elevation of broken parts looking from a point at the right of Fig. 2.

Referring to the letters marked on the drawings, O is the front wall, 0 the side walls, and A the back wall, of the arch which bounds the combustionchamber F and the space 1? below the grate S, Fig. 1. This chamber is of more than the usual height above the grate S and the draft-opening 0, leading through the back wall, A, atthe lower side. This opening 0 leads into the narrow space H, which extends up to the boiler B and thence back beneath the same. The rear portion of the boiler and arch are broken away in Fig. 1; but it will be understood that the heat and flame flow back and thence forward through the boiler-fines to the base of the smoke-stack at the forward end of the boiler. The ordinary hood and smokestack at theforward end of the boiler are not here shown,because this feature is well understood.

I do not limit the invention of the furnace in connection with a boiler. It may be used for other heating purposes.

At U is a space, at the lower end of the space H, into which the ashes and soot fall which beneath the grate S. The arrows on grate S pass through opening a and accumulate in said space H.

At X is a transverse shaft from which the damper V extends upward,elosing most of the opening 0. When sufficient combustion has taken place in the chamber F to cause a strong pressure of heat against the damper V, said damper will be tilted back, as shown by dotted lines in Fig. 1. The damper is counter- ('0 balanced by a weighted arm, WV, at right angles to the shaft. As the pressure of heat diminishes, the damper V will swing toward the opening 0. Then there is no fire in the fur nace, the damper V will rest against the opening 0, as in Fig. 1. The space above the damper affords sufficient draft to cause the fuel to burn. The object of having the damper open farther after the fire is under good headway is to allow the flow of heat into the passage H beneath the boiler, and, as before indicated the object of not allowing it to pass through the opening 0 until the fire is well' under way is that the smoke will be consumed by the great degree of combustion in the chamber F before the proper degree of heat flows on beneath the boiler 13.

The fuel-door D has a shelf, a, upon which the coal is placed, enough being kept on said shelf to stop at the door D. Extending inwardly and downwardly from said shelf is an inclined extension, 1*, down which the coal runs when pushed into the furnace from the door in the ordinary manner.

At 6 is a door through which apoker is inserted to clear the grate or to move or agitate the coal. Below this is an opening through the wall 0, leading into the space or ash-pit l.

E is properly a hearth-opening to supply air 0 show the course of the air through the grate. The arrows in opening 0 and passage H show the course of the flame and heat from the combustion-chamber, and the arrows in the combustion-chamber indicate the presence and action of the flame therein.

At (1, Figs. 2 and 3, are down-draft dampers, the purpose of which is to admit air direct into the chamber F to assist combustion after the damper V has opened.

Having thus described my invention,what I claim as new is- 1. The combination of a boiler, a verticallyenlarged combustion-chamber, a lower rear draft-opening, a narrow passage beneath the boiler into which said opening leads, a suitable grate, an air-induction opening leading beneath the grate, and a fuel-supply opening, substantially as set forth.

2. The combination of a boiler, a combustion-chamber, a passage leading up to and back beneath the boiler, a lower draft-opening leading from said chamber into said psssage, a damper in the draft-opening, a grate in the chamber, an air-induction opening leading beheath the grate, and a fueLsupply opening, substantially as set forth.

3. The combination of a boiler, an enlarged combustion-chamber having a draft-opening at the lower rear side, a narrow passage leading from said opening up and back beneath the boiler, a swinging damper to said opening counterbalanced by a weight, a grate, a fuelsupply opening, and an air-induction opening beneath the grate, substantially as set forth.

4. The combination of a boiler, a combustion-chamber beneath increased in depth, a draft-opening at the lower rearside of said chamber, a damper to said opening, a narrow passage leading from the opening upward and back beneath the boiler, an ash-pit below the damper, a suitable fuel-door, and an air-induction opening leading beneath the grate, substantially as set forth.

5. The combination of a boiler, a vertically-enlarged combustion-chamber, downdraftports leading into said chamber, dampers to said openings, a lower rear draft-opening, a damper therefor, a narrow passage leading from the opening up and back beneath the boiler, a grate in the chamber, an airinduction leading beneath the grate, and a fuel-supply opening, substantially as set forth.

In testimony of the foregoing I have hercunto subscribed my name in presence of two witnesses.

MICHAEL H. STEELE.

.W'itnesses:

DANIEL S. PEMBROKE, WILL It. DEWEY. 

